1 files changed, 109 insertions, 0 deletions
diff --git a/src/projections/ccon.cpp b/src/projections/ccon.cpp
new file mode 100644
index 00000000..4f7dedb4
--- /dev/null
+++ b/src/projections/ccon.cpp
@@ -0,0 +1,109 @@
+/******************************************************************************
+ * Copyright (c) 2017, Lukasz Komsta
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+#define PJ_LIB__
+#include <errno.h>
+#include "proj.h"
+#include "projects.h"
+#include "proj_math.h"
+
+#define EPS10   1e-10
+
+namespace { // anonymous namespace
+struct pj_opaque {
+    double phi1;
+    double ctgphi1;
+    double sinphi1;
+    double cosphi1;
+    double *en;
+};
+} // anonymous namespace
+
+PROJ_HEAD(ccon, "Central Conic")
+    "\n\tCentral Conic, Sph\n\tlat_1=";
+
+
+
+static XY forward (LP lp, PJ *P) {
+    XY xy = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+    double r;
+
+    r = Q->ctgphi1 - tan(lp.phi - Q->phi1);
+    xy.x = r * sin(lp.lam * Q->sinphi1);
+    xy.y = Q->ctgphi1 - r * cos(lp.lam * Q->sinphi1);
+
+    return xy;
+}
+
+
+static LP inverse (XY xy, PJ *P) {
+    LP lp = {0.0,0.0};
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(P->opaque);
+
+    xy.y = Q->ctgphi1 - xy.y;
+    lp.phi = Q->phi1 - atan(hypot(xy.x,xy.y) - Q->ctgphi1);
+    lp.lam = atan2(xy.x,xy.y)/Q->sinphi1;
+
+    return lp;
+}
+
+
+static PJ *destructor (PJ *P, int errlev) {
+    if (nullptr==P)
+        return nullptr;
+
+    if (nullptr==P->opaque)
+        return pj_default_destructor (P, errlev);
+
+    pj_dealloc (static_cast<struct pj_opaque*>(P->opaque)->en);
+    return pj_default_destructor (P, errlev);
+}
+
+
+PJ *PROJECTION(ccon) {
+
+    struct pj_opaque *Q = static_cast<struct pj_opaque*>(pj_calloc (1, sizeof (struct pj_opaque)));
+    if (nullptr==Q)
+        return pj_default_destructor (P, ENOMEM);
+    P->opaque = Q;
+    P->destructor = destructor;
+
+    Q->phi1 = pj_param(P->ctx, P->params, "rlat_1").f;
+    if (fabs(Q->phi1) < EPS10)
+        return destructor (P, PJD_ERR_LAT1_IS_ZERO);
+
+    if (!(Q->en = pj_enfn(P->es)))
+        return destructor(P, ENOMEM);
+
+    Q->sinphi1 = sin(Q->phi1);
+    Q->cosphi1 = cos(Q->phi1);
+    Q->ctgphi1 = Q->cosphi1/Q->sinphi1;
+
+
+    P->inv = inverse;
+    P->fwd = forward;
+
+    return P;
+}
+
+